Alghazzawi Tariq F, Janowski Gregg M
Department of Prosthetic Dental Sciences, College of Dentistry, Taibah University, Madina, Kingdom of Saudi Arabia.
Department of Materials Science and Engineering, School of Engineering, The University of Alabama at Birmingham, Birmingham, USA.
Int J Oral Sci. 2016 Sep 29;8(3):164-71. doi: 10.1038/ijos.2016.20.
The purpose of this study was to determine if there is an effect of liner and porcelain application (layering and pressing techniques) on the surface of yttria-stabilized tetragonal zirconia polycrystals (Y-TZP), which were exposed to permutations of liner, layered porcelain, and pressed porcelain. Scanning electron microscope (SEM)/energy dispersive spectroscope (EDS) was used to identify changes in composition and microstructure after removing liner and porcelain with hydrofluoric acid. Simulated aging was also conducted to determine the effect of liner and porcelain on low-temperature degradation. The control group had a typical equiaxed grain structure, referred to as unaffected. When covered with liner or porcelain, some areas changed in structure and composition and were termed affected. The frequency of affected structure decreased when liner was covered with either layered porcelain or pressed porcelain. There were statistical differences (P<0.05) in the composition between affected and unaffected for zirconium (layered porcelain with liner: affected=60% (0.8%) (m/m), unaffected=69% (4%), layered porcelain without liner: affected=59% (3%), unaffected=65% (3%)) and oxygen (layered porcelain with liner: affected=35% (2%), unaffected=26% (4%), layered porcelain without liner: affected=35% (3%), unaffected=30% (2%)). However, there were statistical differences (P<0.05) in the composition for zirconium and oxygen of the aged layered porcelain without liner only. The liner should not be used before porcelain application, especially when using the layering technique for zirconia restorations. Furthermore, pressing should be considered the technique of choice over layering.
本研究的目的是确定衬层材料和瓷层应用（堆筑和压制技术）对暴露于衬层材料、堆筑瓷和压制瓷不同组合下的钇稳定四方多晶氧化锆（Y-TZP）表面是否有影响。使用扫描电子显微镜（SEM）/能谱仪（EDS）来识别用氢氟酸去除衬层材料和瓷层后成分和微观结构的变化。还进行了模拟老化实验以确定衬层材料和瓷层对低温降解的影响。对照组具有典型的等轴晶粒结构，称为未受影响。当覆盖有衬层材料或瓷层时，一些区域的结构和成分发生了变化，称为受影响。当衬层材料上覆盖堆筑瓷或压制瓷时，受影响结构的频率降低。对于锆（有衬层材料的堆筑瓷：受影响 = 60%（0.8%）（质量分数），未受影响 = 69%（4%）；无衬层材料的堆筑瓷：受影响 = 59%（3%），未受影响 = 65%（3%））和氧（有衬层材料的堆筑瓷：受影响 = 35%（2%），未受影响 = 26%（4%）；无衬层材料的堆筑瓷：受影响 = 35%（3%），未受影响 = 30%（2%）），受影响和未受影响区域的成分存在统计学差异（P<0.05）。然而，仅对于无衬层材料的老化堆筑瓷，锆和氧的成分存在统计学差异（P<0.05）。在进行瓷层应用之前不应使用衬层材料，尤其是在对氧化锆修复体使用堆筑技术时。此外，应考虑将压制技术作为优于堆筑技术的选择。
